{"action":"created","comment":{"url":"https://api.github.com/repos/kripken/emscripten/pulls/comments/134605119","pull_request_review_id":57916349,"id":134605119,"diff_hunk":"@@ -1143,8 +1143,11 @@ def check(input_file):\n           # if not wasm-only, we can't do async compilation as the build can run in other\n           # modes than wasm (like asm.js) which may not support an async step\n           shared.Settings.BINARYEN_ASYNC_COMPILATION = 0\n+          warning = 'This will reduce performance and compatibility (some browsers limit synchronous compilation), see https://github.com/kripken/emscripten/wiki/WebAssembly#codegen-effects'\n           if 'BINARYEN_ASYNC_COMPILATION=1' in settings_changes:\n-            logging.warning('BINARYEN_ASYNC_COMPILATION requested, but disabled since not in wasm-only mode')\n+            logging.warning('BINARYEN_ASYNC_COMPILATION requested, but disabled because of user options. ' + warning)\n+          elif 'BINARYEN_ASYNC_COMPILATION=0' not in settings_changes:\n+            logging.warning('BINARYEN_ASYNC_COMPILATION disabled due to user options. ' + warning)","path":"emcc.py","position":9,"original_position":9,"commit_id":"d7741b5ef98639b62c9630370990ba6d64a4e23b","original_commit_id":"d7741b5ef98639b62c9630370990ba6d64a4e23b","user":{"login":"kripken","id":173661,"avatar_url":"https://avatars0.githubusercontent.com/u/173661?v=4","gravatar_id":"","url":"https://api.github.com/users/kripken","html_url":"https://github.com/kripken","followers_url":"https://api.github.com/users/kripken/followers","following_url":"https://api.github.com/users/kripken/following{/other_user}","gists_url":"https://api.github.com/users/kripken/gists{/gist_id}","starred_url":"https://api.github.com/users/kripken/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kripken/subscriptions","organizations_url":"https://api.github.com/users/kripken/orgs","repos_url":"https://api.github.com/users/kripken/repos","events_url":"https://api.github.com/users/kripken/events{/privacy}","received_events_url":"https://api.github.com/users/kripken/received_events","type":"User","site_admin":false},"body":"Yeah, it would be better to be much more granular. But the link to the wiki page in the error here should help. And I think there will be churn here with options moving to support async compilation, so I'd rather not hardcode a list that could get out of date.\r\n\r\nI could be wrong though and we'll see users say this isn't a good enough warning, we can iterate on this then.","created_at":"2017-08-22T21:21:19Z","updated_at":"2017-08-22T21:21:19Z","html_url":"https://github.com/kripken/emscripten/pull/5497#discussion_r134605119","pull_request_url":"https://api.github.com/repos/kripken/emscripten/pulls/5497","_links":{"self":{"href":"https://api.github.com/repos/kripken/emscripten/pulls/comments/134605119"},"html":{"href":"https://github.com/kripken/emscripten/pull/5497#discussion_r134605119"},"pull_request":{"href":"https://api.github.com/repos/kripken/emscripten/pulls/5497"}}},"pull_request":{"url":"https://api.github.com/repos/kripken/emscripten/pulls/5497","id":136867585,"html_url":"https://github.com/kripken/emscripten/pull/5497","diff_url":"https://github.com/kripken/emscripten/pull/5497.diff","patch_url":"https://github.com/kripken/emscripten/pull/5497.patch","issue_url":"https://api.github.com/repos/kripken/emscripten/issues/5497","number":5497,"state":"open","locked":false,"title":"Warn when async wasm compilation is disabled","user":{"login":"kripken","id":173661,"avatar_url":"https://avatars0.githubusercontent.com/u/173661?v=4","gravatar_id":"","url":"https://api.github.com/users/kripken","html_url":"https://github.com/kripken","followers_url":"https://api.github.com/users/kripken/followers","following_url":"https://api.github.com/users/kripken/following{/other_user}","gists_url":"https://api.github.com/users/kripken/gists{/gist_id}","starred_url":"https://api.github.com/users/kripken/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kripken/subscriptions","organizations_url":"https://api.github.com/users/kripken/orgs","repos_url":"https://api.github.com/users/kripken/repos","events_url":"https://api.github.com/users/kripken/events{/privacy}","received_events_url":"https://api.github.com/users/kripken/received_events","type":"User","site_admin":false},"body":"Aside from being slow, it can make code fail in chrome, so we should warn at compile time when user options force 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